package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@Service
@Transactional
//由于在 saveWithFlavor 方法中，进行了两次数据库的保存操作，
// 操作了两张表，那么为了保证数据的一致性，我们需要在方法上加上注解 @Transactional来控制事务。
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {
    @Autowired
    private DishFlavorService dishFlavorService;
    @Autowired
    private DishService dishService;
    /**
     * 新增菜品，同时保存对应的口味数据
     * @param dishDto
     */
    @Override
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品基本信息到菜品表dish
        this.save(dishDto);
        //②. 获取保存的菜品ID ;
        Long dishId = dishDto.getId();
        //③. 获取菜品口味列表，遍历列表，为菜品口味对象属性dishId赋值;
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map((item) ->{
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());
        //④. 批量保存菜品口味列表;
        //保存菜品口味到口味表dish_flavor
        dishFlavorService.saveBatch(flavors);
    }

    @Override
    public DishDto getByIdWithFlavor(Long id) {
        //根据id查询菜品的基本信息
        Dish dish = dishService.getById(id);
        //将dish中的基本属性复制给新的dishDto
        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish,dishDto);
        //根据菜品id查询菜品口味列表数据
        //查询当前菜品对应的口味信息，从dish_flavor表查询
        //LambdaQueryWrapper<Object> lqw = new LambdaQueryWrapper<>();
        LambdaQueryWrapper<DishFlavor> lqw = new LambdaQueryWrapper<>();
        lqw.eq(DishFlavor::getDishId,dish.getId());
        List<DishFlavor> flavors = dishFlavorService.list(lqw);
        dishDto.setFlavors(flavors);
        return dishDto;
    }

    @Override
    public void updateWithFlavor(DishDto dishDto) {
        //更新dish表基本信息
        this.updateById(dishDto);
        //清理当前菜品对应口味数据  dish_flavor表的delete操作
        LambdaUpdateWrapper<DishFlavor> lqw = new LambdaUpdateWrapper<>();
        lqw.eq(DishFlavor::getDishId,dishDto.getId());
        dishFlavorService.remove(lqw);
        //添加当前提交过来的口味数据  dish_flavor的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();

        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }
}
